Machine switching device



C. L. GOODRUIVI.

MACHINE SWITCHING DEVICE.

APPLICATION FILED FEB. 24, I9I9.

Patented Dec. 12, 1922.

OIIII nntrsn srarasrarenr V CHARLES L. GOODRUM, OF NEW YORK, N. Y., ASSIGNOB T WESTERN ELECTEIG COMPANY, INCORPORATED, OF NEW YORK, N. "EL, A CORPORATION OF NEW YGRK. v

, MACHINE SWITCHING DEVICE.

Application filed ls ebruary 24, 1919. Serial No. 278,926

Toallwhomz'tmay concern: A v brush tripping shaft is providedwith a" Be it known that I, CHARLES L. GooDrUM, plurality of angularly displaced fingers a. citizen of the United States, residing at 66 which are set in response to the operallew York, in the county of New York, tion ofa stepping magnet? toa position to 5 State of New York have invented certain engage a right angularly extending end 8 new and useful Improvementsin Machine on a'flcrush tripping lever 9 to trip the tlwitching Devices, of which the following brushes 10, 11, 12 and 13 when a shaft l t, G 0 1 is a full, clear, concise, and exact description. upon which these brushes, are carried, is This invention relates to telephone switchmoved upwardly. 1 v ing systems, and more particularly toia tele The register mechanism through which phone switching system of the automatic or the brush carriage movement is controlled semi-automatic type in which the bru h set simultaneously with the sending of impulses 65 ting operation is controlled by power driven from the calling substation, comprises an mechanism. insulating cylinder 16 upon which is mount-' The object of this invention is to provide ed a conducting plate 17 having a stepped an organization of apparatus and circuits or staggered edge formed by cutting away in a system of this class, whereby the period portions thereof, in accordance with the 70 of operation of the apparatus,.in completing group arrangement of the contact banks. a call between the callingand called sub- Therotation otthis register is controlled 2o scribers lines, may be reduced to amini through the agency of a stepping magnet mum. 20 which is actuated in response to calling Features of l the invention are the roim ulses from the calling station as ,Will 75 t l a 7 I H vision of a register device controlled by imhereinafter more fully appear. H y y l pulses from the substation sender, and In the operationof. the system embodypower driven switch, which is started simuling features of this invention, a subscriber gtaneously with the beginning of the first, A, in initiating a call by removinghis re-v train of impulses, and is operated in accordceiver from the switchhook, will have his so ance with th ovement of the register, the line automatically connected with a trunk arrangement being such that the switch can; line through the agency of a line finder keep pace with the impulses sent, but never switch diagrammatically indicated at 23.1

advance beyond a corresponding po'sitionof When the subscribers line is connected to the register until the trunk hunting stage thetrunk, a double wound relayQGpulls up 85 of operation is reached. r and completes a circuit for a slow release This maybe accomplished by means of ,a relay f The operation of the dial 28 at register mechanism operated in response to subscriber station A intermittentlyhopens impulses from the calling station and conand closes the circuit ofthe double wound trolling in its operation the simultaneous relay 26, and its armature upon retrac-, 9o

. operation of the brush carriage. The registion completes a circuit, for a brush-select tor preferably comprises acontact carrying ing" magnet 7 which is operated to rotate 40 cylinder operated step by step in response the brush-selecting shaft 5 to hrmga finger to calling impulses, and having a contact (3 thereon in position to trip' a selected sgurlace over which a brush or contact carof brushes. This operating circuit will be 95 ried by the brush shaft is moved to control from battery '30, through the wind ng of the the operating circuit ot the power driven magnet 7, over conductor 31, through the mechanism which operates the brush car first contact of side-switch arm 82, through riage. front contact and armature of the relay 27 the circuit organization, in which the brush of the relay 26, to ground. A circuit is carriage apparatus and the register are also completed for a relay 33 which holds illustrated schematically. energized a slow release escape magnet. 345.

The brush carriage of this invention may Upon the termination of the first series oi: be similar to that shown in Patent No. impulses, relay 26 remains energized and 105 1,123,696, exceptnthat in this invention a remains deenergizemthereby open ng the The drawing is adiagrammaticvview of, and through the back contact and armature circuit of the escape magnet 34, causing its deenergization and permitting it to move its wipers into their second position.

The subscriber new again operates .the dial 28, and upon the first retraction of the armature of relay 26, a circuit iscompleted from battery, through theregister or group selecting magnet 20, over conductor 35, side-switch arm 32 in its second position, front contact and armature of relay 27, and back contact and armature of relay 26, to

ground. -Up0n a continued operation of the,

sending dial, impulses will be sentthrough the controlling magnet to rotate the drum or cylinder 16. The conducting plate 17 on the, cylinder 16 is connected with ground which, upon the first rotary step of the cylinder 16, will be connected through the brush or wiper 91 with a circuit'which in cludes an up-drive magnet of the brush carriage. This circuit 3 will be from bat t'ery,through up -dr ve magnet40, conductor 41, conductor 42, brush 91, and contact plate 17, to ground. On the completion of this circuit the brush carriage shaft 14 will move upwardly until the wiper 9]; tliBfGOIliiJOVGS from the conducting plate 17 onto a poition of" the insulating cylinder 16. At or before this time, however, another impulse from the calling'station will have beenreceived tooperate the controlling magnetQO to rotate the cylinder and bring anotherstep of the contact plate '17 into engagementwith the wiper 91'. This will 'CELUSQthB brushes to'move'over the second group of trunks. The operation'is' continued until the desired group has been selected and the impulses from the calling stationhave ceased, when relay 26 again remains energized, relay 33 dropsoif and opens the circuit of the slow release escape ,magnet 34, therebycausing, the side-switcharm to move intopos'itiOn no. 8, providing the contact upon whichthe cylinder 16 conductor 72. and back contact and armature of relay 33, to ground. The hunting movement of the brushes is there; fore continued due to the closure of the circuit' extending from grounded battery, winding of rip-drive power magnet 40, conductor 41 side, switch arm 46 in its second 30- sition, conductor 47, armature and back contact of relay conductor"70 contact 71, conductor 72, arnu-iture and back contact of relay 33 to ground until the test brush 13 finds a grounded contact, whereupon the circuit or relay 45 will be completed from battery, over' conductor 48, through sideswitch arm 49, over conductor 50, and through test brush 18, to ground. Upon the energization of 45 the escape magnet 34 is deenergized to move the side-switch arms into position No, 3, thereby completing the circu'ittrom the calling subscribers line to the trunk over which the called subscriber is to be connected. I V

Upon the first step of the brush stepping magnet 7, a circuit is completed for relay 51 from battery, through back contact of. relay 51, through contact 52 01"? the stepping magnet, to ground. Relay 51 is pulled up over this circuit, andcompletes a locking circuit or itself through 'an oil-normalcontact 18 of thebrush tripping shaft 5. In the normal operationof the switch, a holding magnet 53 {for releasing the brush tripping spindle 5 is operated to restore the spindle when the switch'shaft 14 moves from normal position and'closes contact '54. Should it occur, however, that the subscriberabandone the call during the first series of impulses, the circuit for 53 will be completed through the left, outermost contacts or": 51, back contact of 27, and back contact of26. The switch is released by placing a direct ground upon the brushQ which completes a circuit for the down drive magnet 55 from battery, through the winding of the down-drive magnet, over conductor 56, hroughside-switch wiper 57 in its third position and over conductor 50, to the grounded brush. Down-drive magnet55, in pulling up, retracts a holding pawl 58, and completes a locking circuit for itself through an off-normal contact 59 which will be maintai'ned until the brush shaft 14 is returned to its normal position.

Then the brush shaft 14 reaches its normal position, a projection 60 thereon engages the tail of a holding'pawl 61 to release the'register cylinder 16, thereby permitting it toreturn to its normal position.

Should it happen that the brushesget ahead of the register, they will be delayed momentarily until the register makes a succeeding step unless they are in the group in which hunting is to take place,-in which case theymay come to rest on the idle trunk before the'change-over occurs. On the other hand, it the brushes are behind the movement of the register, they will complete their operation.

'What, is claimed is: 1. In a telephone switching system, a subscribers impulse sending. mechanism, a stepby-step register device responsive to impulses f-rom said impulse sending mechanism, a power driven selector switch, a

driving circuit for said selector switch established at each step of said register device, and means to insure correct positioning of said switch at any relative speed of operation of said step-by-step device.

2. In a telephone switching system, a subscribers impulse sending mechanism, a power driven selector switch, register means operated directly by said impulse sending means and adapted in its operation to cause the operation of said selector switch simultaneously with the operation of said sending mechanism and in synchronism therewith, and means to insure correct positioning of said switch at any relative speed of operation of said register means.

3. In a telephone switching system, a subscribers impulse sending mechanism, a registering device, a power driven selector switch selectively operated in accordance with the position of said register, a brush movable by said selector switch, a driving circuit for said selector switch extending through said movable brush, and vmeans to close said driving circuit successively in accordance with the positioning of said register.

4. In a telephone switching system, a subscrib'ers impulse sending mechanism, a power driven selector switch, a registering device, means to position said register device in response to actuation of said impulse sending mechanism, means to initiate operation of said selector switch as soon as said impulse sending mechanism is actu- 5. In a telephone switching system, a sub-' scribers impulse sending mechanism, a stepby-step register device responsive to impulses from said impulse sending mechanism, a power driven selector switchoperated in response to the operation of said register device and simultaneously with the operation of said impulse sending mechanism to move its brushes over a terminal group for each impulse of the impulse sending mechanism, and means to insure correct positioning of said switch at any relative speed of operation of said step-by-step device. 4

6. In a telephone switching system, a subscribers impulse sending mechanism, a stepby-step register device responsive to impulses from said impulse sending mechanism and having a staggered or stepped contact surface, a power driven selector switch having a wiper thereon adapted to cooperate with the contact surface of said step-loy-step reg ister, and an operating circuit for said switch controlledthrough the engagement of said wiper with said contact surface.

In witness whereof, I hereunto subscribe my name this 18th day of February A. D, 1919.

CHARLES L. GOODRUM. 

